No guarantee, I'm afraid, but I've found several in the chests in the peasants' houses. If you haven't entered every house yet (for the first time), you could save outside the door, check, and reload again, if you don't find one. A bit time-consuming, though. That's the trouble with random loot.
Blasted bad luck! Very frustrating, I know. That's why I never really cared for random loot: it's a double-edged sword -- sometimes you get what you want, other times you end up reloading. At any rate, have fun with the pick-axe.